Log render function of ReactJS

react-0.14.0.js

// replace the _renderValidatedComponent in react-0.14.0.js with this function
  _renderValidatedComponent: function () {
    // orginal function
    function renderValidatedComponent() {
      var renderedComponent;
      ReactCurrentOwner.current = this;
      try {
        renderedComponent = this._renderValidatedComponentWithoutOwnerOrContext();
      } finally {
        ReactCurrentOwner.current = null;
      }
      !(
        // TODO: An `isValidNode` function would probably be more appropriate
        renderedComponent === null || renderedComponent === false || ReactElement.isValidElement(renderedComponent)) ? process.env.NODE_ENV !== 'production' ? invariant(false, '%s.render(): A valid ReactComponent must be returned. You may have ' + 'returned undefined, an array or some other invalid object.', this.getName() || 'ReactCompositeComponent') : invariant(false) : undefined;
      return renderedComponent;
    }
    //NOTE!!! custom code
    if (process.env.NODE_ENV !== 'production') {
      var whatToLog = (localStorage.getItem('log-components') || '').split(',');
      var name = this.getName();
      if (name && !name.match(/^ReactDOM/) && whatToLog[0] === 'All' ? true : whatToLog.indexOf(name) > -1) {
        console.debug("render: ", name, {props: this._instance.props, state: this._instance.state});
      }
      return renderValidatedComponent.apply(this, arguments);
    } else {
      return renderValidatedComponent.apply(this, arguments);
    }
  },

in local storage, just put names of components you want to log
log-components: Component1,Component2
if you decide to log all app render functions, just add on first place All then it will log every render log-components: All,Component1,Component2

source form:
http://stackoverflow.com/questions/30445568/react-js-modify-render-method-for-all-components